You can do this manually by finding and removing these files:
* In /System/Library/Caches: o fontTablesAnnex (fontTablesAnnex contains the character encodings/mappings for all of the fonts on your system. Information in this file can lead to garbled text.) o com.apple.ATS.System.fcache o com.apple.ATSServer.FODB_System
* In /Library/Caches: o com.apple.ATS
* In your home directory’s Library/Preferences folder: o com.apple.ATS.plist